Does drug and alcohol use undermine concordance between doctors' assessments of major depression and patients' scores on a screening tool for depression among gay men attending general practice?

General practitioners (GPs) identify that depression can be difficult to diagnose in populations with high rates of alcohol and other drug (AOD) use. This is a particular concern with gay men who are a population known to engage in high rates of AOD use and who are vulnerable to depression. This paper uses data from 563 gay men and their GPs to describe concordance between assessments of major depression and, in particular, whether AOD use undermines concordance. Data were collected as part of a larger study of male patients and GPs at high HIV-caseload general practices in Australia. Concordance was measured by comparing patients' scores on the Patient Health Questionnaire-9 screening tool, which is based on the Diagnostic and Statistical Manual of Mental Disorders IV criteria, and GPs' ratings of the likelihood of depression for each participant. We observed high concordance between GPs' assessments of major depression and patients' scores on the PHQ-9 (79% agreement), although our analysis also suggested that concordance was better when it related to cases in which there was no depression. The high concordance observed in our study did not appear to be undermined by gay male patients' AOD use, with the exception of frequent use of crystal methamphetamine. Here, men who reported frequent use of methamphetamine were significantly less likely to have concordant assessments (adjusted odds ratio 0.3, 95% CI 0.1-0.8). Overall, GPs appear to identify depression among many of their gay male patients. While GPs should be aware of the potential complications presented by frequent crystal methamphetamine use, other AOD use may have less impact on the diagnosis of depression.

Comparing 'doctor' and 'patient' beliefs about the role of illicit drug use in gay men's depression.

High rates of both illicit drug use and depression are consistently reported among gay men. However, little is known about how beliefs about drug use shape clinical encounters between gay men and health professionals, and that in turn affect clinical communication and care, particularly in relation to depression. We compared 'doctor' and 'patient' beliefs about the role of illicit drug use in gay men's depression. Semi-structured interviews were conducted during August-December 2006 with 16 general medical practitioners working in seven 'gay-friendly' practices in Sydney, Adelaide and a rural-coastal city in New South Wales, and during February-May 2008 with 40 gay men with depression recruited through four Sydney and Adelaide practices. A thematic analysis of these two sets of interviews found that doctors expressed the beliefs that: illicit drug use is related to depression in gay men; illicit drug use impedes effective diagnosis and treatment of depression in gay men; and illicit drug use increases the level of complexity involved in caring for gay men with depression. Gay men expressed the beliefs that: illicit drug use is closely related to depression; illicit drug use can be helpful in dealing with difficult experiences; and illicit drug use is just what you do as a gay man living in a big city. Both groups believed drug use and depression were related, but doctors emphasised the negative outcomes of drug use and interpreted these in relation to health. Gay men believed that drugs could have both negative and positive uses and differentiated between health and social outcomes. While the doctors articulated a pragmatic position on drug use, which is consistent with harm reduction principles, communication with gay male patients could be enhanced if both groups acknowledged their divergent views of illicit drugs and their potential role in mental health.

Use of respondent-driven sampling to enhance understanding of injecting networks: a study of people who inject drugs in Sydney, Australia.

BACKGROUND: Respondent-driven sampling (RDS) is a method for recruiting hidden populations, such as people who inject drugs (PWID). In RDS, participants recruit their peers into the study; who recruited who into the study is tracked, and thus information is gathered on the population's social networks. The purpose of this study was to use information collected from an RDS study of PWID to determine the size and structure of injecting networks and whether network characteristics are associated with sharing injecting equipment. METHODS: A study was launched in Sydney, Australia in 2009 with five seeds, who were asked to recruit three participants each into the survey. This process was repeated until the target sample size was reached. The median size of injecting networks and the homophily (a measure of in-group affiliation) of different subgroups were calculated. Participants' information was linked with that of their recruiter to form dyads, and multivariate analysis was conducted to determine whether dyad and injecting network characteristics were associated with sharing injecting equipment within the dyads. RESULTS: The injecting networks were large, the lowest median subgroup network size being 12. Homophily estimates indicated a lack of strong ties both within and across groups. In the multivariate analysis, factors significantly associated with sharing injecting equipment within dyads were feeling very close to their recruiter and having one or both members of the dyad identify as Aboriginal or Torres Strait Islander and one or both members having not been tested for hepatitis C in the previous year. CONCLUSION: RDS provided valuable information on injecting networks in Sydney. PWID were shown to be socially connected with a large number of other injectors, and affiliations were formed without regard to demographic or drug use characteristics. Linking information from the recruits with that of their recruiter was a useful way of organizing information to gain a more complete understanding of risk behaviour.

Conducting a respondent-driven sampling survey with the use of existing resources in Sydney, Australia.

BACKGROUND: Respondent-driven sampling (RDS) is a form of chain-referral sampling that is increasingly being used for HIV behavioural surveillance. When used for surveillance purposes, a sampling method should be relatively inexpensive and simple to operate. This study examined whether an RDS survey of people who inject drugs (PWID) in Sydney, Australia, could be successfully conducted through the use of minimal and existing resources. METHOD: The RDS survey was conducted on the premises of a local needle and syringe program (NSP) with some adjustments to take into account the constraints of existing resources. The impact of the survey on clients and on staff was examined by summarizing NSP service data and by conducting post-survey discussions with NSP staff. RESULTS: From November 2009 till March 2010, 261 participants were recruited in 16 waves. A significant increase was found in the number of services provided by the NSP during and after data collection. Generally, staff felt that the survey had a positive impact by exposing a broader group of people to the NSP. However, conducting the survey may have led to privacy issues for NSP clients due to an increased number of people gathering around the NSP. CONCLUSIONS: This study shows that RDS can be conducted with the use of minimal and existing resources under certain conditions (e.g., use of a self-administered questionnaire and no biological samples taken). A more detailed cost-utility analysis is needed to determine whether RDS' advantages outweigh potential challenges when compared to simpler and less costly convenience methods.